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Experimental development tool for HDR modes

Sebastian Wick requested to merge swick/mutter:hdr-experimental into main

This MR makes it possible to turn on PQ + Rec2020 on displays which support it with a bit of js magic in lg:

global.compositor.backend.get_monitor_manager().experimental_hdr = 'on'
global.compositor.backend.get_monitor_manager().experimental_hdr = 'off'

In a future MR the string should contain the TF, Colorspace and HDR metadata instead of just an on/off switch for PQ + Rec2020. This is only intended to experiment with HDR modes and displays.

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